Did you check all your fuses? Seems like I remember somebody having that problem. May or may not have been the cigarette lighter circuit too, can’t remember. I’d check them all, and if they’re ok, try a different auto store, maybe he doesn’t know what he’s doing.

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Sounds like a blown cig lighter/accesory fuse under the hood. The obd is on the same circuit. It should be a 15 amp but I don't recall what number fuse. 28 maybe?